Colcrete
预填骨料灌浆混凝土
🗣️ 情景例句
OK, what do you need most of all?
好， 你们最需要的是什么？
Have you taken a train?
你坐过火车吗？
Though a number of descents have been made, much of it still remains to be explored.
人们多次进入洞内探险，但至今尚有不少东西有待勘探。